Tampa, Florida -- A drug deal gone bad resulted in a showdown outside a Tampa Police District Office and the arrest of two men Friday afternoon.

Tampa Police say Milton Coley met up with Louis Ruiz-Machado at 109th Avenue and Lantana Avenue to conduct a drug deal at 12:40 p.m. When Coley refused to pay Ruiz-Machado for the marijuana, Ruiz-Machado fired a shot and Coley ran off.

Coley then called for a friend to pick him up in the 200 block of Bougainvillea Avenue. As Coley got into his friend's Nissan Altima, Ruiz-Machado started chasing them in his pickup truck.

Afraid for his safety, Coley's friend drove to the Tampa Police Department's District 2 Office for help. Ruiz-Machado followed them there and chased them around twice through the parking lot and fired a shot at them. He then fled as officers came out of the district office with guns drawn.

A short time later, they found Ruiz-Machado on USF's campus at Bull Run Drive and Elm Drive. USF Police, Florida Highway Patrol, and the Hillsborough County Sheriff's Office all helped arrest him. During his arrest, they recovered a gun inside the truck.

Ruiz-Machado, 19, has been charged with aggravated assault with a firearm, possession of marijuana.

During the parking lot incident at the district office, witnesses say they saw Coley throw two large baggies with 59 grams of marijuana into the parking lot.